Lifting jack



April 29 192%,

E. CARETT LIFTING JACK Original Filed June 6, 1922 vma Patented pr. 29,1924.

UNITED STATESv 11,492,159 PATENT OFFICE.

ETTORE CARETTA, OF TURIN, ITALY'.

LIFTING Jacx.

Original application med June 6, 1922, Serial No. 566,276. Divided andthis application lled August 8,

1928. Serial Nb. 856,088.l

To all whom t may concern:

Be it known that I, ETTORE CAnn'rrA, subject of the King of Italy,residing at Turin, Italy, have invented certain new and usefulImprovements in Lifting Jacks, of which the following is aspecification. v

This invention relates to liftin jacks and more particularly to jackslifting member movable in said base and a collapsible chamber arrangedbetween said base and member, this chamber being adapted to receive afluid under ressure for the purpose of lifting said mem er and its load.

According to the-present invention a 'ack of the kind above referred tois provided with means for admitting in said collapsible chamber a gascharge from a receptacle or cartridge in which said as is stored inliquid state (known as sparklet s) this as being permitted to expand insa 1d chamer and producing therein the lifting pressure.

A. constructional form of an improved 'ack according to the presentinvention is illustrated by way of example on the annexed drawing inwhich /1- Figure 1V is an axial section of the iinproved jack in its4normal position before ifting;

Figure 2 is a similar section showing the lifting member in a raisedposition.

In the illustrated example the improved jack comprises a hollowstationary base 1 open at the top, and in the mouth 2 ,of which there ismounted so as to be capable of vertical motion a tubular lifting' member3.

This liftin member carries an adjustable head 4, pre enably by means ofa screwthreaded spindle 5 screwing in a screwthreaded hole in the top 6of the lifting member 3.

Said member 3 is provided with an abutment 3 for stopping it when it hasreached its uppermost position.

Between the inside wall of the base 1 and the youtside wall of themember 3 there is a space in which is located a dexible chamber 7 havingpreferably the shape shown onthe drawing, which is such that its upperhalf is readily capable of collapsing into its lower half as shown inFigure 1.

Said chamber 7 is made of suitable material, for instance rubber, so asto be caor lifting vehicles, comprising a stationary base, a

pable of being inflated and expandingunder internal pressure from theshape shown in Figure l to that-shown in Figure 2. In the case ofrubber, the wal-1 of the air chamber 7 is referably reinforced by anetwork 7 of suitable material incorporated in the rubber for the pu oseof giving it the .strength 4necessary or withstanding high internalpressures while avoidin the necessity of enclosing said chamber in anouter cover.

In' order to effect the inflation of the chamber 7 by using `cartridgeor receptacles filled with a compressed gas in liquid state (such asliquid carbonio acid) the collapsible chamber 7 is provided with a union8 comprising a socket 9 forming a mouth. A perforated needle 10 isarranged central-ly in the mouth of said socket and has its perforationopening in the passage of the union 8. Said socket mouth is providedwith a packing washer 19 and has an outer screw-thread on which isthreaded a sleeve 20 of a support 11 intended to receive a cartridge 12and having an abutment 21 for the cartridge end as well as a rib 17 fort grasping and manipulating it.

Said cartridge 12 contains a gas in liquid state, as carbonio acid, andits mouth is closed by means of a metal plug (not shown) adapted to beperforated by the needle 10.

For the o eration, the jack is located iinder the load and its liftinghead d is carried in Contact with the said load by manipulatingthe'screw 5; then a cartridge 12 is located in the support 11 and itsmouth is inserted into the packing 19 and finally the support 11 isrotated by its' rib 17 to force the cartridge 12 against the perforatingpin 10. The cartridge plug is thus perforated and the cartridge space isputin communication with the chamber 7 through the perforation of thepin 10 and the .5. of the union 8; owing to the increase in vounie freefor the cartridge content, the gas enclosedi init in liquid state ispermitted to expand and to enter in gaseous state the chamber 7 to inateit and to raise the lifting member 3 supported thereby and the load. Theparts are thus carried in the position shown by Figure 2 in which thechamber 7 is shown in its expanded shape.

The improved jack is very light because all gearing is done away with;it can be ica so that it can be utilized as a container for storing asuitable number of sparklets 12 to be employed for operating the jack.

The s ace left free intermediate the base wall an the wall of thelift-in member 3 is preferably small, as shown, or the purpose ofreducing to a minimum the portion 22 of the chamber 7 subjected' topressure and not supported by rigid parts, and therefore the tensilestress acting on said chamber.

Attention is called to my copending application No. 566,276, filed June6, 1922, in respect of features not claimed per se in this application,but described or illustrated.

What I claim as my invention and desire to secure by United StatesLetters Patent 1. A fluid operated lifting jack comprising a hollowbase, a member movable in said base, an inflatable collapsible chamberbetween said base and member, a receptacle containing a gas charge inliquid state, and means for putting said receptacle in communicationwith said chamber to produce a lifting pressure therein.

2. A fluid operated lifting jack compris-- ing a hollow base, a liftingmember movable in said base, an inflatable collapsible chamber betweensaid base and member, a receptacle containing a gas charge in liquidcondition, means for connecting said receptacle with said chamber andmeans for opening said receptacle to introduce said gas in said chamberand produce a lifting pressure therein.

3. A fluid operated lifting jack comprising a hollow base, a liftingmember movable in said base, an inflatable collapsible chamber betweensaid base and member, a union connected with said chamber, a support onsaid union, a receptacle containing' a gas charge in liquid conditionadapted to be arranged in said support, cooperating means on said unionand support for putting said receptacle' in communication v with saidchamber to introduce said gas in said chamber and to reduce a liftingpressure therein.

4. A fluid operated lifting jack comprising a hollow base, a liftingmember movable in said base, an inflatable colla sible chamber betweensaid base and mem er, a union connected with said chamber, a support onsaid union, a receptacle containin a gas charge in liquid conditionadapte to be arranged in said support with its mouth in register withsaid union, means -in said union for perforating the mouth of saidreceptacle cooperating means on said su port an union for forcing saidreceptac e with its mouth against said erforating means for the purposeof intro ucing said gas in said chamber and producing a lifting pressuretherein.l

5. A-fluid operated lifting jack comprising a hollow base, a liftingmember'movable in said base, an inflatable collapsible chamber betweensaid base and member, a union connected with said chamber, a support onsaid union, a receptacle containing a gas charge in liquid conditionadapted +o be arranged in said support with its mouth in register withsaid union, means in said union for perforating the mouth of saidreceptacle, a screw-threaded ortion on said union and a screw threadscollar on said support engaging said screw threaded portion of saidunion for forcing said receptacle with its mouth4 against' saidperforatin means, for the purpose of introducing said gas in saidchamber and producing a lifting pressure therein.

. 6. A' fluid operated lifting jack comprising a hollow base, a liftingmember movable in said base, an inflatable collapsible chamber betweensaid base and member, a receptacle containing a gas charge in liquidcondition, means for putting said receptacle in communication with saidchamber to produce a lifting pressure therein and an adjustable loadsupporting head on said lifting member, this lifting member being hollowfor storing therein said' receptacles to be vused in connection with thejack.

In testimony whereof I have signed my name to this specification. i

ETTORE CARETTA.

